Glow plug



' c. A. RUDQUfsT 2,140,943

@Low PLUG i original Filed April 22, 1956 Patented Dec. zo, 193s 2,140,943

UNITED STATES PATET OFFECE GLOW PLUG Carl August Rudquist, deceased, late of Lidingo,

Sweden, by Karin Katharina Rudquist, executrix, Lidingo, Sweden Application April 22, 1936, Serial No. 75,897. Re-

newed May 9, 1938. In Germany February 25,

1 Claim. (Cl. 12S-145) This invention relates to internal combustion ical. The glow plug is placed in position in the engines and more particularly to devices known following manner: The twisted part of the reas glow plugs for assisting the combustion of sistance wire is inserted into the central hole 1 fuel charges in internal combustion engines. and the conical portion of the @011 e is forced Glow plugs usually include a body which is up against the conical end il oi the plug body. 5

screwed into the cylinder wall, an electrode and Then the plug is screwed into the bore hole lll a projecting coiled resistance wire secured at one by means of the thread 8, thus causing the conend to the electrode and at the other end to the ical portion of the coil 5 to be interposed between body. the conical end 9 and bore hole lil. The tight- 10 The object oi this invention is to increase the ening takes place by ll. i3 is an additional in- 10 strength of the glow plug and to form them in sulation. The extension l2 oi the insulated bolt such a manner, that the wire coil can be readily l is supplied for connection ci a terminal wire.

inserted. Having thus described the invention what is These and other objects of the invention will claimed as new and desired to be secured by appear from the following description taken in Letters Patent is:

connection with the drawing which forms a part A glow plug for an internal combustion engine of the specication and which shows a medial comprising a body with a conical base, an elecsectional view oi a glow plug incorporated with trede insulated therefrom and carried by the the invention as it appears applied to the top body and a resistance wire coiled exteriorly of horizontal wall of an engine cylinder. the body, said wire having a central twisted part,

Referring to the drawing by Characters 0f refwhich is inserted into a central hole in the elecerence, I represents the glow plug body, 2 a SleeVe, trode, the end of the coil being conical whereby,

3 insulating means, 4 the insulated bolt 01 elecwhen the glow plug is screwed into the cylinder trede and 5, 6 the resistance Wlle- The Sleel/e 2 wall of said internal combustion engine, the conkeeps the insulation 3 in its place and by means iea1 end of said wire is interposed between the 25 of the screw thread 8 the plug S SCICWBd H1170 said conical end of the plug body and a conical the wall of the engine cylinder. The resistance opening provided in the Cylinder Wan,

wire consists of the coiled part 5, which is cylindrical in form except the upper portion is con- KARIN KATHARINA RUDQUIST, NE BOTT,

iCal, and the Central Part O 'GWO 0r mOle twisted Administratrice of the Estate of Carl August Rud- 30 wires. The base 9 of the plug body is conical quist,

and the bore hole I0 in the cylinder is also con- 

